Lamp guard for portable electric lights



' Jan. 3',

LAMP GUARD FOR PORTABLE ELECTRIC LIGHTS Filed Dec. 17, 1937 INVEN'EFOR. w (Hahn s Ludvvfq BY ATTORNEY.

Q L. LUDWIG. 2,142,362

Patented Jan. 3, 1939 UNITED STATES PATENT OFF-ICE 'LAlVlP GUARD FOR PORTABLE ELECTRIC LIGHTS 2 Claims.

My invention relates to a lamp guard'for portable electric lights and more particularly to the means for clamping such a guard to the handle memberof the lamp. It has for one 'of its main objects to provide a lamp guard which may be secured to the light without the use of tools, which will be securely held in place, and which can easily be removed for the substitution of new lamp bulbs. Another object is to provide self- 10 aligning means for securing the locking members in their proper positions. Additional objects are to provide a lamp guard of simple construction,

which has no parts easily broken or apt to get out of order, and which can be manufactured at a 15 relatively low price.

These and various other objects and advantages will be readily understood from the following description and from the accompanying drawing of a preferred embodiment of the invention, in

which, however, modifications may be made without departing from the scope of the appended claims. In the drawing,

Fig. 1 is a front elevation of the lamp guard shown attached to a part of a lamp handle;

25 Fig. 2 is a top view of Fig. 1;

Fig. 3 is a bottom view;

Fig. 4 is another side elevation shown with the guard open and ready to be secured to the lamp handle;

30 Fig. 5 is an enlarged view of the clamping straps;

Fig. 6 is a fragmental view of one of the clamping straps; and

Fig. 7 is a side view of one of the locking mem- 35 bers.

Referring now to all the views simultaneously, the lamp guard consists of two semi-circular straps ID and I l and a circular disk l2 in which a plurality of holes are drilled. A plurality of wire 40 members I3 each have one end secured to one of the straps and the other end inserted in one of the holes in the disk l2. These wire members are curved so as to encase an electric lamp bulb which, however, is not shown. Semi-circular 45 wire members l4 and I5 are soldered or otherwise secured, to the wire members l3 to hold these at the correct spacing and prevent distortion. The ends of the wires I3 are bent in underneath the disk l2 and the holes in the disk are 50 loose enough to enable the wires sufficient freedom in these holes to cause the two halves of the guard to be spread apart as shown in Fig. 4.

A hook I 6 is secured in the center of the disk I2 I and is used for suspending the whole device. A 55 reflector I1 is preferably secured in one of the parts of the guard. A handle member is shown at [8. This handle member contains a lamp receptacle in which the electric bulb is inserted and is made with an axial opening [9, as shown in Fig.

3, through which the electric wires of the lamp 5 pass. As all of these are standard parts none of them have been shown. An annular groove 20 is formed in the handle member and the straps l0 and H fit in this groove. Elongated slots 2| are formed in the ends 22 of the straps, while locking members 23 are riveted in the other ends 24 of the straps. The ends 22 and 24 are normally spaced from each other to permit yielding towards each other. These locking members are riveted in such a manner that they may easily be turned.

Referring now more particularly to Figs. 5, 6 and 7; in clamping the straps to the handle the locking members are twisted so that they will pass through the slots 2|, or in the position shown in the right hand side of Fig. 5, after which they are turned, as shown in Fig. 6 at the left hand side of Fig. 5, thus, locking the straps in the recess in the handle member.

To prevent accidental turning of the locking 25 members, depressions 25 are formed in the ends 22, as are also two sloping faces 26. The locking members 23 are provided with two angular faces 21 which, when turned, engage on the sloping faces 26 and depress the ends 22 until the lock- 30 ing member can snap into the depression 25. This construction effectively prevents accidental turning of the locking members and clamps the guard more securely to the handle member. Similarly the inclined edges 21 of the locking wings 23 cam the ridges formed at the sides of the transverse depressions 25 to unlock the device. The sides of the depressions 25 incline upwardly and outwardly but substantially perpendicularly and the wings have straight edges, adjacent the stems on which they are rotatably mounted on the other ends 24, to fit the depressions 25.

While I have shown and described a wire cage constructed in a particular manner, it is evident that this wire cage might be made in many different ways. The only requirement being that it must be possible to separate it sothat the clamping straps can be placed around the handle member, or any other part on which clamped.

Having described the invention and its objects, what I claim as new and wish to protect by Letters Patent is:-

1. In combination with a lamp guard of the class described and comprising a cage made in ill two separable parts each consisting of a plurality of curved wires having one of their ends secured to a clamping strap; said members formed on the clamping straps, an elongated slot formed in one of the side members of each strap, locking members pivotally secured in the other side members, said side members being normally spaced apart and yieldable towards each other, said locking members adapted to be inserted through the said slots and turned transversely thereof to press the side members towards each other and to clamp the straps around the member of the lamp to which the guard is attached, and transverse depressions formed on the slotted side members for retaining the locking members in their locked positions.

2. In combination with a lamp guard of the class described and comprising a cage made in two separable parts each consisting of a plurality of curved wires having one of their ends secured to a clamping strap; side members formed on the clamping straps, an elongated slot formed in one of the side members of each strap, said side members being normally spaced apart and yieldable towards each other, locking members pivotally secured in the other side members, said locking members adapted to be inserted through the said slots and turned transversely thereof to press the side members towards each other and to clamp the straps around the member of the lamp to which the guard is attached, transverse depressions formed on the slotted side members for retaining the locking members in their locked positions, each of said depressions being bounded by parallel ridges the inner walls of which are inclined outwardly from the depression but are substantially perpendicular and the outer walls of which are in the form of slow inclines to a plane substantially coincident with the bottom of the depression, and means associated with the slotted side members and with the locking members for facilitating the turning of the locking members comprising flat wings having stems rotatably mounted in one member, each of the wings having a stem pivotally mounted in the opposite side member, and each of the wings having transverse fiat walls adjacent the stems connecting with inclined walls that serve to cam the ridges to compress the slotted members to unlock them.

LOUIS LUDWIG. 

